Wheel dressing mechanism



April 17, 1934. V c OTT ET AL 1,955,202

- WHEEL DRESSING MECHANISM Filed Aug. 13 1929 5 Sheets-Sheet 1 IN VENTORI CONRAD L.OTT

BY Enema P. WINE HHROLD ELBHLSIGER W ATTORNEY April 17, 1934. TT ET AL1,955,202

' WHEEL DRESSING MECHANISM Filed Aug. 13, 1929 3 Sheets-Shet 2 IN VENTOR I CONRHD L. OTT BY EDGHR P. WINE HFIROLD E. BHLSIGER W/A TTORNEYApril 17, 1934.

C. L. OTT ET AL WHEEL DRES S ING MECHANI SM Filed Aug. 13 1929 3Sheets-Sheet 3 hm? 1w. a i'u .uJ I 6.0 I

j INVENTOR CONRAD 1.. OTT BY EDGAR F? WINE HA Rom Ev BALmm -fizwh ifiATTORNEY Patented Apr. 17, 1934 UNITED STATES 1,955.20: warm. nanssmormcnamsu Conrad L. on, Edgar 1*. Wine, and Harold E. Balsiger,Waynesboro, Pa. assignors to Landis Tool Company, Waynesboro, Pa... acorporation of Pennsylvania Application August 13,

. 3 Claims.

Referring to theaccompanying drawings which are made a part hereof andon which similar reference characters indicate similar parts,

Figure 1 is a partial end elevation of a grinding machine showing ourdevice partially in section,

Figure 2 is a front elevation of the wheel base partially in section,substantially on line 2-2 of Figure 1,

Figure 3 is a sectional plan view of the hydraulic mechanism.

Figure 4 is a view showing more in detail the mounting of the wheeldressing tool.

In the drawings reference character 10 indi-'- cates the bed of agrinding machine having a workcarriage 11 and a wheel base 12 mounted ona sub-slide 13 on the bed. A grinding wheel 15 is mounted on the wheelbase and has a wheel fender 14 mounted ajacent it. A shaft 16 isrotatably mounted in the wheel base and has on its outer end a handwheel 17 by means of which it may be manually rotated. The shaft 16 hasa worm 18 thereon which meshes with a worm wheel 19 on a shaft 20. Theother end of the shaft 20 has a beveled pinion 21 thereon which mesheswith a corresponding bevel gear 22 on a shaft 23. The lower end of theshaft 23 is ifiachined to form--a pinion whichineshes with a rack 25 onthe sub-slide 13 to move the wheel base toward and from the work. Duringgrinding operations the sub-slide 13 is moved by power mechanism notshown to feed the grinding wheel into the work, such mechanism beingwell known in machines of this kind. The shaft 16 also has a worm gear26 which meshes with a worm wheel 27 which wheel is loosely mounted on ashaft 28. The shaft 28 is screw threaded on its lower end to engage athreaded lug 29 on a slide 30. The slide 30 is mounted in a bracket 31which is secured to the wheel fender 14. A block 32 carrying a diamondfor dressing the wheel is mounted on the slide 30 and is moved by thescrew 28 toward and from the grinding wheel. The worm wheel 27 has acone-shaped depression in its hub engageable by a correspondingcone-shaped clutch 33. As stated the worm wheel 27 is normally rotatablymounted on the shaft '28. When, however, the clutch 33 has been screwed,down 1929, Serial No. 385,602

until its end engages the worm 2'7 the worm 2 is then keyed to the shaft28.

From the description so far given it will be seen that when the clutch33 is in engagement with the worm wheel 27 rotation of the hand wheel 17will move the wheel base toward the work and at the same time willrotate the shaft 28 to move a diamond carrying block 32 towards thegrinding wheel. The gearing connection is such that the diamond moves agiven distance toward the wheel and the wheel moves the same distancetoward the work for a given rotation of the hand wheel 1'7. Thus theamount of material removed from the grinding wheel is exactlycompensated by movin the \wheel base a similar distance toward the work.The mechanism for moving the pressing tool across the face of a grindingwheel will now be described. A casting 34 is secured to the front sideof the wheel base. This casting is provided with bores 35, 36 and 37 toprovide for fluid piston 38 reversing valve 39 and plunger 40,respectively. The valve 39 controls admission of fiuid from the pressureline 41 to the ports 42 and 43 and exhaust'from these ports to theexhaust lines 44 and 45.- A throttle valve 46 may be placed in thepressure line 41. It will be clear from the description just given thatthe position of the piston 38 is determined by the position of the valve39 with respect to the pressure line 41 and the fluid ports 42 and 43through which fluid enters into the chambers at opposite sides of thepiston 38. A piston rod 4'? extends outwardly through one end of thebore 35 and is threaded to receive nuts 48 and 49 which may beadjustably spaced apart thereon. The other end 50 of the piston rodextends out through the casing and has the block 32 secured thereon, inwhich block is carried the dressing tool 62. A nut 63 is screw threadedinto the" interior of a cuii64 to compress packing 65 therein. A coverplate 66 is secured in the casing 34 by nuts or screws and this coverhas a portion 6'! around which fits the holder block 32, a key 68 beingsecured to the portion 67 to prevent rotation of the block. Packing 69may be secured in place by a plate 70.

The lever 51 is pivoted at 52 and has a lower bent and in which iscarried a roller 53. The plunger 40 has a V-shaped outer end engageableby the roller 53. The plunger 40 is backed by. a spring 54 seatedagainst a plug 55 screw threaded into one end of the bore 37. The valve39 has a stem 55, the outer end of which is threaded to receive nuts 56and 5'1 which are spaced apart from each other. The lever 51 restsbetween the nuts 48 and 49, 56 and 57. The purpose of the lever 51 is tooperate the valve 39 which controls the admission of fluid to operatethe piston 38. A second lever 58 is pivoted also at 52 and has its outerend bent up and engageable by the end of the rod 47.. The other end ofthe lever 58 carries m-retracted position out of engagement by theroller 53. A hook 60 in the lower end of lever. 58

' has a spring 61 secured thereto, the other end of the spring beingsecured to the casting 34. i The purpose of the spring'61 is to hold theupper end of lever 58 constantly in engagement withthe rod 47.

The operation of the device is as follows: During grinding the wheelbase 13 is moved towardthe work by suitable power means, well-known inmachines of this character. The sub-slide 13 always moves against afixed stop, not shown. To provide for variation in the diameterof thework piece and for wear on the grinding wheel the wheel base is moved onthe sub-slide by means of the hand wheel 17 through the gearing whichhas been described. When the operator wishes to dress the grinding wheelhe screws down the clutch 33 to cause it to engage the worm wheel 27,which normally rotates freely on the shaft 28, then as he rotates thehand wheel 17 to feed the wheel in toward the work he also feeds thediamond toward the wheel and the gearing is such that both wheel anddiamond move exactly the same distance. The amount of material removed Ifrom the grinding wheel is exactly compensated by moving the wheel basea similar distance toward the work. When the wheel base has been movedthe desired distance the operator then moves the lever 51 to the left,to shift the reversing valve 39 as shown in Fig. 3, or to the right, asshown in Fig. 2. Pressure fluid enters from port 41 through port 42 tomove piston 38 to the right as shown in Figure 3 to start movement ofthe block 32 carrying the diamond slowly across the face ofthe grindingwheel. The speed with which the piston moves to the right is determinedby the adjustment of the throttle valve 46. As the piston approaches theend of its stroke the nut 48 engages the lever-51 and shifts it towardthe right. As the roller 53 passes the vertex of the cam on the plunger40, the plunger shifts the lever further to the right to cut off ports41 and 42 and to open communication between ports 41'and 43 to admitpressure fluid to the right of the piston, as shown in Figure 3, tostart movement of the piston to the left and return the diamond backacross the face of the grinding wheel. As the piston reverses andapproaches the end of its stroke to the left the rod 47 engages lever 58and swings it to bring roller 59 against the cam plunger 52 to keep thisplunger depressed beyond the reach of roller 53. This prevents reversingof the valve 39 again to move the piston 38 to carry the diamond againacross the wheel. When the piston 38 has moved far enough to center thevalve it stops and the hydraulic mechanism ceases operation until -thelever 51 is again moved to the left by the operator to opencommunication between the ports-41 and 42 to perform another wheeldressing operation. 1

If the operator wishes to feed the grinding wheel for grinding purposeswithout moving the dressing tool the clutch 33 may be disengaged fromthe worm wheel 27 whereupon rotation of the hand wheel 17. will notaffect the position of the diamond holding block 32.

It will be obvious to those skilled in the art that various changes maybe made in our device without departing from the spirit of the invenofthe grinding wheel by the tion and therefore we do not limit ourselvesto what is shown in the drawings and described in thespeciflcation;;but. only; indicated in the appended claimsl-f Havingthus fully described our invention, what we claim as new and desire tosecure by Letters Patent, is:

1. In a grinding machine having a wheel base and'a grinding wheelmounted thereon, means for moving the grinding wheel toward and from thework, a bracket mounted on the wheel base, a wheel dressing devicemounted on said bracket, mean'sincluding a disconnectable clutch memberfor moving the wheeldressing device toward and from the periphery of thegrinding wheel to dress the surface of the wheel, said means beingoperatively connected to the means formoving the grinding wheel towardand from the work in such a manner that the grinding wheel moves towardthe work and the dressing device toward the grinding wheel exactly thesame distance to compensate for stock removed from the peripherydressing operation, said wheel dressing device comprising a fluidoperated dressing tool and manually controlled means for causing thedressing tool to move one way across the face of the grinding wheel andautomatically return to the starting position.

2. In a grinding machine having a wheel base and a grinding wheelmounted thereon, means for moving the grinding wheel toward and from thework, a wheel dressing device, means including a disconnectible clutchmember for moving the wheel dressing device toward and from theperiphery of the grinding wheel to dress the surface of the wheel, saidmeans being operatively connected to the means for moving the grindingwheel toward and from the work in such a manner that the grinding wheelmoves toward the work and the dressing device toward the grinding wheelexactly the same distance to compensate for stock removed from theperiphery of the grinding wheel by the dressing operation, said wheeldressing device comprising a fluid operated dressing tool and manuallycontrolled means for causing. the dressing tool to move one way acrossthe face of the grinding wheel and automatically return to the startingposition, substantially as set forth.

3. In a grinding machine having a wheel base and a grinding wheelmounted thereon, means for dressing the grinding wheel comprising asupport movable toward and from the grinding wheel, a fluid motormounted on said support, said fluid motor being connected to the saidwheel dressing means for moving said means in a direction substantiallytransversely of the plane of the grinding wheel, a valve in control ofsaid motor, a manually operable handle mounted on said support andengageable with a valve stem for shifting said valve to shift thedirection of movement of said motor. to move the dressing tool in onedirection across the face of the grinding wheel, and means movable by apiston of said motor engageable with the said handle for shifting it toreverse said valve to reverse said motor, and means for stopping saidmotor in its starting position, substantially as set forth.

HAROLD E. BALSIGER. CONRAD L. O'I'I'. EDGAR P. WINE.

